The TSM421 is a solid state alternating current (AC) motor timer switch manufactured by SSAC. It is designed to provide short-term motor control, by cycling a motor on and off at predetermined intervals. The TSM421 can be used to provide intermittent motor cycling, slow speed reversing, adjustable timing, and power saving on/off functions. The timer setting range is from 0.5 seconds to 155 minutes, with 13 selectable settings. This timer switch is UL and CSA rated and is suitable for use in many residential, commercial, or industrial applications.